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IPV4: use xor rather than multiple ands for route compare
authorStephen Hemminger <shemminger@vyatta.com>
Thu, 10 Apr 2008 11:00:28 +0000 (04:00 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 10 Apr 2008 11:00:28 +0000 (04:00 -0700)
commitc0b8c32b1c96afc9b32b717927330025cc1c501e
tree34997f5e86aa375746ecbe4f2c8899b4fa774a5etree | snapshot (tar.bz2 tar.gz zip)
parent996b1dbadcbcafb899f022303e01d46ab87920ebcommit | diff
IPV4: use xor rather than multiple ands for route compare

The comparison in ip_route_input is a hot path, by recoding the C
"and" as bit operations, fewer conditional branches get generated
so the code should be faster. Maybe someday Gcc will be smart
enough to do this?

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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